import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

public class TcpEchoClient {
    private Socket socket = null;

    public TcpEchoClient(String serverIP,int port) throws IOException {
        socket = new Socket(serverIP,port);
    }

    public void start() throws IOException {
        Scanner scanner = new Scanner(System.in);
        try (InputStream inputStream = socket.getInputStream();
             OutputStream outputStream = socket.getOutputStream()){
            //将字节流使用printWriter转化为字符流
            PrintWriter printWriter = new PrintWriter(outputStream);
            Scanner scannerFromSocket = new Scanner(inputStream);
            while (true){
                //1、从键盘上读取用户输入的内容
                System.out.println("->");
                String request = scanner.next();
                /*2、把读取的内容构造成请求，发送给服务器
                * 注意！这里的发送是带有换行的*/
                printWriter.println(request);
                printWriter.flush();
                //3、从服务器读取响应内容
                String response = scannerFromSocket.next();
                //4、把响应结果显示到控制台上
                System.out.printf("rep:%s; resp:%s\n",request,response);
            }
        }catch (IOException e){
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws IOException {
        TcpEchoClient client = new TcpEchoClient("127.0.0.1",9090);
        client.start();
    }
}
